Classification of anabolic steroids

Stars are often referred to as early or late types. Early indicates hotter while late indicates cooler. This stems from an early 20th-century model of stellar evolution in which stars were powered by gravitational contraction via the Kelvin–Helmholtz mechanism whereby stars start their lives as very hot "early-type" stars, and then gradually cool down, evolving into "late-type″ stars. This mechanism provided ages of the Sun that were much smaller than what is observed, and was rendered obsolete by the discovery that stars are powered by nuclear fusion . [51]

The classification was invented by Herbert Putnam in 1897, just before he assumed the librarianship of Congress. With advice from Charles Ammi Cutter , it was influenced by his Cutter Expansive Classification , the Dewey Decimal System , and the Putnam Classification System (developed while Putnam was head librarian at the Minneapolis Public Library ). [2] [3] It was designed specifically for the purposes and collection of the Library of Congress to replace the fixed location system developed by Thomas Jefferson . By the time Putnam departed from his post in 1939, all the classes except K (Law) and parts of B (Philosophy and Religion) were well developed.

Classification of anabolic steroids

classification of anabolic steroids

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